JPS62233406A - Warming device for stream regulating valve - Google Patents
Warming device for stream regulating valveInfo
- Publication number
- JPS62233406A JPS62233406A JP7659686A JP7659686A JPS62233406A JP S62233406 A JPS62233406 A JP S62233406A JP 7659686 A JP7659686 A JP 7659686A JP 7659686 A JP7659686 A JP 7659686A JP S62233406 A JPS62233406 A JP S62233406A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- valve
- temperature
- regulating valve
- warming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010792 warming Methods 0.000 title claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 15
- 239000012080 ambient air Substances 0.000 claims description 5
- 230000008646 thermal stress Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
Landscapes
- Control Of Turbines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、タービンプラントにおける蒸気加減弁のウオ
ーミング装置に関し、特にタービンの起動時間を削減す
るのに好適な蒸気加減弁のウオーミング装置を提供する
ものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a warming device for a steam regulating valve in a turbine plant, and particularly provides a warming device for a steam regulating valve suitable for reducing startup time of a turbine. It is something.
タービンへの蒸気量を調整する蒸気加減弁は厚内機器の
ため、起動時に蒸気を急に入れると機器の内外壁温度差
は大きくなり、寿命消費が大きくなり５亀裂が発生する
。従って、タービンに通気する前にウオーミングを行う
。ウオーミング方法は、主蒸気止め弁、蒸気加減弁を全
閉し、主蒸気止め弁の中に内蔵型になっているか、また
は、外部設置型の並列弁を全開し、主蒸気止め弁と蒸気
加減弁の間の圧力を上げた後、並列弁を全閉する。The steam control valve that adjusts the amount of steam to the turbine is a built-in device, so if steam is suddenly introduced at startup, the temperature difference between the inside and outside walls of the device will increase, which will increase the life consumption and cause cracks to occur. Therefore, warming is performed before ventilating the turbine. The warming method is to fully close the main steam stop valve and steam control valve, fully open the built-in parallel valve in the main steam stop valve, or the parallel valve installed externally, and then close the main steam stop valve and steam control valve. After increasing the pressure between the valves, fully close the parallel valves.
このとじこめられた蒸気の熱により、蒸気加減弁を加熱
する。蒸気はドレン化し、圧力は下がる。The heat of this trapped steam heats the steam control valve. The steam becomes condensate and the pressure decreases.
圧力が下がると排水弁を開け、ドレンを排出する。When the pressure drops, open the drain valve and drain the condensate.
次に並列弁を開き、主蒸気止め弁と蒸気加減弁の間の圧
力を少し上げた状態で、同じ操作手順を繰り返しながら
、最終的には、目標到達温度で、加減弁の内外壁の温度
差が一定値以内に相当するまで、手動で並列弁の開閉を
数回行わなければならない。このように、従来のウオー
ミング方法では。Next, open the parallel valve, and while repeating the same operating procedure with a slight increase in the pressure between the main steam stop valve and the steam regulator valve, the temperature of the inner and outer walls of the regulator valve will finally reach the target temperature. The parallel valves must be manually opened and closed several times until the difference corresponds to within a certain value. In this way, with the traditional warming method.
操作が繁雑で、且つ、時間がかかる等の欠点があった。This method has drawbacks such as complicated and time-consuming operations.
また、プラントの停止時間が短く、加減弁の内外壁の温
度降下量が少なく、ウオーミングが不要な場合でも、プ
ラント起動時の負荷増加量が大きな場合は、加減弁の内
壁温度の上昇率が外壁温度の上昇率より大きくなり、加
減弁内外壁温度差の制限値を越えてしまうという欠点が
あった。In addition, even if the plant stoppage time is short and the temperature drop on the inner and outer walls of the regulator valve is small and warming is not necessary, if the load increase at plant start-up is large, the rate of increase in the temperature of the inner wall of the regulator valve will be lower than that of the outer wall. This has the drawback that the rate of increase in temperature is greater than the rate of increase, and the limit value for the temperature difference between the inner and outer walls of the control valve is exceeded.
特開昭５７−１１６１０６号では、主蒸気止め弁前の主
蒸気温度をとらえ、主蒸気温度により、昇温率を決定し
、並列弁の開度を制御している。しかし、この例には、
次のような欠点がある。In Japanese Patent Laid-Open No. 57-116106, the main steam temperature before the main steam stop valve is detected, the temperature increase rate is determined based on the main steam temperature, and the opening degree of the parallel valve is controlled. However, in this example,
It has the following drawbacks:
（１）加減弁の熱応力は、加減弁の内外壁温度差により
生じるが、この例は主蒸気温度を内壁湿度とほぼ一定と
考えているが、厳密には等しくない。(1) Thermal stress in the control valve is caused by the temperature difference between the inner and outer walls of the control valve, and although in this example the main steam temperature is considered to be approximately constant with the inner wall humidity, they are not strictly equal.
（２）加減弁内外壁の許容値を満足した最短時間のウオ
ーミングではない。加減弁ウオーミングは通常一時間以
上かかるが、時間を短縮することが望まれているが１本
公知例では、主蒸気温度の上昇率により加減弁のウオー
ミングを行っているための最短時間にはならない。(2) The warming time is not the shortest that satisfies the allowable values for the inner and outer walls of the control valve. Warming of the control valve normally takes over an hour, but although it is desired to shorten the time, in one known example, the warming of the control valve is performed depending on the rate of increase in main steam temperature, so this is not the shortest possible time. .
上記従来技術は、蒸気加減弁のウオーミングを行うこと
を前ていとしたものであり、ウオーミングの要否を判定
するということは考慮されておらず、その要否を適切に
判定すれば、不要なウオーミング時間を削除できると考
えられる。The above-mentioned conventional technology is based on warming the steam control valve in advance, and does not take into consideration determining whether or not warming is necessary. It is conceivable that the warming time can be eliminated.
本発明の目的は、ボイラ出口の蒸気温度、蒸気加減弁の
内、外壁温度及び加減弁外部ふん囲気温度により熱力学
的伝熱特性を考慮し蒸気加減弁のウオーミングの要否及
び蒸気加減弁のウオーミングを行う際の並列弁の開度を
ウオーミング時間が最短となるように開度設定を与える
ことにより蒸気加減弁のウオーミング時間を最短とする
ことにある。The purpose of the present invention is to consider the thermodynamic heat transfer characteristics based on the steam temperature at the boiler outlet, the temperature of the inner and outer walls of the steam control valve, and the temperature of the surrounding air outside the control valve, and to determine whether or not warming the steam control valve is necessary. The purpose is to minimize the warming time of the steam control valve by setting the opening degrees of the parallel valves during warming so that the warming time is the shortest.
上記目的は、ボイラ出口の蒸気温度、加減弁内。 The above purpose is to measure the steam temperature at the boiler outlet and the temperature inside the control valve.
外壁温度及び加減弁外部ふん囲気温度の熱伝達及び熱伝
導特性より、現在のボイラ出口蒸気温度の蒸気を加減弁
ウオーミングせずにタービン通気量の蒸気量を流した時
に、加減弁の内外壁温度が。Based on the heat transfer and heat conduction characteristics of the outer wall temperature and the ambient air temperature outside the regulator, when steam at the current boiler outlet steam temperature is flowed at the amount of steam equivalent to the turbine ventilation amount without warming the regulator, the temperature of the inner and outer walls of the regulator will change. but.
どの程度になるかを予測し、加減弁ウオーミングの要否
を判定する。また、加減弁ウオーミングが必要な場合に
は、その加減弁内外壁温度差が、熱応力を発生しない許
容範囲以内で最大となる様に蒸気流量を調節することに
より達成できる。Predict how much it will be and determine whether or not adjusting valve warming is necessary. Further, if the regulating valve warming is required, it can be achieved by adjusting the steam flow rate so that the temperature difference between the inner and outer walls of the regulating valve is maximized within an allowable range that does not generate thermal stress.
蒸気加減弁のウオーミングの要否の判定は、ボイラ出口
蒸気温度、加減弁内、外壁温度、加減弁外部ふん囲気温
度の熱伝達特性により、現状の蒸気を規定量流すと加減
弁内外壁温度差が何度になるか判定できるので、それが
許容範囲以内であれ、ばウオーミング不要と判定する。The necessity of warming the steam control valve can be determined based on the heat transfer characteristics of the steam temperature at the boiler outlet, the internal and external wall temperatures of the control valve, and the surrounding air temperature outside the control valve.When a specified amount of current steam is flowed, the temperature difference between the inner and outer walls of the control valve is determined. Since it can be determined how many times the temperature is, if it is within the allowable range, it is determined that warming is not necessary.
また、ウォーミ゛）ング要と判定された場合は、蒸気量
をどの程度にすれば、許容温度以内となるかを計算し、
その蒸気量以内で、できるだけ計算結果の蒸気量に近い
値の蒸気量を流すことにより最小の時間で蒸気加減弁の
ウオーミングを行うことができる。In addition, if it is determined that warming is necessary, calculate how much steam should be used to keep the temperature within the allowable range.
By flowing a steam amount as close to the calculated steam amount as possible within the steam amount, the steam control valve can be warmed in the minimum time.
以下本発明の一実施例を第１図、第２図及び第３図によ
り説明する。An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3.
第１図は蒸気加減弁ウオーミングの概略系統図を示す。FIG. 1 shows a schematic system diagram of the steam control valve warming.
ボイラ１より発生する蒸気により、蒸気止め弁２に並列
に設置されている並列弁３を開閉することにより蒸気を
加減弁４内に流入させウオーミングを行い発生したドレ
ンはドレン弁５により排出する。ウオーミング完了後蒸
気はタービン６に供給される。The steam generated from the boiler 1 opens and closes the parallel valve 3 installed in parallel to the steam stop valve 2 to cause the steam to flow into the control valve 4 for warming, and the generated drain is discharged by the drain valve 5. After warming is completed, steam is supplied to the turbine 6.
第２図は、壁と両側の流体間の熱伝達について示す。こ
の平板を加減弁壁と仮定し一次元熱伝導とするとこの間
には以下の式が成り立つことが知られている。FIG. 2 shows the heat transfer between the wall and the fluid on both sides. Assuming that this flat plate is the control valve wall and assuming one-dimensional heat conduction, it is known that the following equation holds between them.
ΔＸ
＝ ｈａ （Ｔｏ Ｔ＾）”（１）
ここでｑ１７は熱流量、ｈ夏 １４は蒸気と加減弁内壁
間の熱伝達率、Ａは今回考慮する加減弁壁の断面積、Ｔ
ｃ８は加減弁内部蒸気温度、Ｔｒｉ。ΔX = ha (To T^)” (1) Here, q17 is the heat flow rate, h summer 14 is the heat transfer coefficient between the steam and the inner wall of the control valve, A is the cross-sectional area of the control valve wall considered this time, T
c8 is the internal steam temperature of the control valve, Tri.
は加減弁内壁温度、ｋ１５は加減弁壁材の熱伝導率、Δ
ｘ１３は加減弁壁の厚さ、Ｔｏｌｌは加減弁外壁温度、
ｈｏ１６は加減弁外壁と加減弁外部ふん囲気間の熱伝達
率、Ｔ＾９は加減弁外部ふん囲気温度をあられす。is the control valve inner wall temperature, k15 is the thermal conductivity of the control valve wall material, Δ
x13 is the thickness of the control valve wall, Toll is the temperature of the control valve outer wall,
ho16 is the heat transfer coefficient between the outer wall of the regulator valve and the ambient air outside the regulator valve, and T^9 is the temperature of the ambient air outside the regulator valve.
ここで、ボイラ出口蒸気温度ＴＢ７と、ボイラと加減弁
入り口開の温度降下量ΔＴ１２、ボイラ出口蒸気のもつ
熱流量ｑ１７及び加減弁外部ふん囲気温度Ｔ＾９がわか
ると、加減弁内外壁温度差が求められる。つまり、現在
の温度の蒸気を加減弁内に流入させた時の内外壁温度差
が予測できることになる。Here, if we know the boiler outlet steam temperature TB7, the temperature drop amount ΔT12 between the boiler and the opening of the regulator valve inlet, the heat flow rate q17 of the boiler outlet steam, and the ambient temperature T^9 outside the regulator valve, we can calculate the temperature difference between the inner and outer walls of the regulator valve. is required. In other words, it is possible to predict the temperature difference between the inner and outer walls when steam at the current temperature flows into the control valve.
以上をもとに考案した蒸気加減弁のウオーミング装置１
８を第３図に示す。Warming device for steam control valve devised based on the above 1
8 is shown in FIG.
外部から取り入れられるボイラ出口蒸気温度Ｔｅ７．加
減弁外部ふん囲気温度Ｔ＾９及びボイラ８口蒸気の持つ
熱流ｆｑ１７を伝熱計算部１９にて並列弁３を全開した
場合の計算を行い、加減弁内壁及び外部温度１０．１１
を得、それらの差分２０より加減弁内外壁温度差入Ｔ′
を求め、その値が、加減弁で熱応力を発生する制限値を
超えるかどうか判定２１し、超える場合は並列弁のウオ
ーミング開度計算２２を行い内外壁温度差が制限を超え
ない様開度設定２３をし、開度変換器２４により並列弁
３に開度を設定する。Boiler outlet steam temperature Te7. The temperature T^9 of the ambient air outside the regulator valve and the heat flow fq17 of the steam from the eight boiler ports are calculated in the heat transfer calculation unit 19 when the parallel valve 3 is fully opened, and the inner wall and external temperatures of the regulator valve 10.11 are calculated.
From the difference 20 between them, the temperature difference between the inner and outer walls of the control valve T'
Determine whether the value exceeds the limit value that generates thermal stress in the control valve 21. If it exceeds, calculate the warming opening of the parallel valve 22 and adjust the opening so that the temperature difference between the inner and outer walls does not exceed the limit. Setting 23 is performed, and the opening degree of the parallel valve 3 is set by the opening degree converter 24.
また、ウオーミング不要２５と判定された場合はウオー
ミング不要で通気の為の条件を設定２６し、外部へ出力
２７する。Further, if it is determined that warming is not necessary 25, conditions for ventilation without warming are set 26 and output 27 to the outside.
以上の装置により、加減弁の内外壁の温度伝達特性を考
慮することによって加減弁ウオーミングの要否の判定を
行え、また加減弁ウオーミングを最短の時間で行うこと
ができる。With the above device, it is possible to determine whether or not moderation valve warming is necessary by considering the temperature transfer characteristics of the inner and outer walls of the moderation valve, and it is also possible to perform moderation valve warming in the shortest possible time.
本発明によれば、加減弁のウオーミングの要否の判定及
び、加減弁ウオーミングの際の熱流量を制御することに
より加減弁ウオーミング時間を最短にすることができる
ので、タービンの起動準備の為の時間を削減することが
できる。According to the present invention, it is possible to minimize the moderating valve warming time by determining whether or not warming the moderating valve is necessary and controlling the heat flow rate during warming the moderating valve. time can be reduced.
第１図は本発明の一実施例の蒸気加減弁ウオーミングの
概略系統図、第２図は、蒸気加減弁の一次元定常熱伝達
モデルを示す説明図、第３図は、本発明による蒸気加減
弁ウオーミング装置のブロック図である。Fig. 1 is a schematic system diagram of the steam control valve warming according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing a one-dimensional steady heat transfer model of the steam control valve, and Fig. 3 is a diagram showing the steam control valve warming according to the present invention. FIG. 2 is a block diagram of a valve warming device.
Claims (1)
度及び加減弁外部ふん囲気温度の温度差に応じて、蒸気
加減弁のウオーミングの要否を判定し、また、ウオーミ
ング要と判定された場合は、これらの温度により主蒸気
止め弁と並列に設けた並列弁の開、閉を行い、蒸気加減
弁のウオーミングを行うことを特徴とする蒸気加減弁の
ウオーミング装置。1. Depending on the temperature difference between the steam temperature at the boiler outlet, the internal and external wall temperatures of the steam control valve, and the ambient air temperature outside the control valve, it is determined whether or not the steam control valve needs to be warmed, and if it is determined that warming is necessary. A steam regulating valve warming device characterized in that, when the temperature is high, a parallel valve provided in parallel with the main steam stop valve is opened and closed to warm the steam regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7659686A JPS62233406A (en) | 1986-04-04 | 1986-04-04 | Warming device for stream regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7659686A JPS62233406A (en) | 1986-04-04 | 1986-04-04 | Warming device for stream regulating valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62233406A true JPS62233406A (en) | 1987-10-13 |
Family
ID=13609695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7659686A Pending JPS62233406A (en) | 1986-04-04 | 1986-04-04 | Warming device for stream regulating valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62233406A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011012567A (en) * | 2009-06-30 | 2011-01-20 | Mitsubishi Heavy Ind Ltd | Method and device for controlling valve for warming steam turbine |
| CN112554966A (en) * | 2020-11-17 | 2021-03-26 | 北方魏家峁煤电有限责任公司 | Control system and method for quick warm valve of main steam valve of steam turbine |
-
1986
- 1986-04-04 JP JP7659686A patent/JPS62233406A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011012567A (en) * | 2009-06-30 | 2011-01-20 | Mitsubishi Heavy Ind Ltd | Method and device for controlling valve for warming steam turbine |
| CN112554966A (en) * | 2020-11-17 | 2021-03-26 | 北方魏家峁煤电有限责任公司 | Control system and method for quick warm valve of main steam valve of steam turbine |
| CN112554966B (en) * | 2020-11-17 | 2023-03-28 | 北方魏家峁煤电有限责任公司 | Control system and method for quick warm valve of main steam valve of steam turbine |
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